Issuing Body: Guozun Cathay Associates Japan Office
Date of Conclusion: 28 April 2026
Key Outcome: Completed estate right confirmation and transfer through domestic judicial proceedings, fully mitigated Sino-Japanese cross-border tax risks, and the estate totalling RMB 3.8 million was successfully vested in the Chinese national heir.
This case was jointly handled by the Japan Office of Guozun Cathay Associates and the Cross-Border Family Affairs & Wealth Succession Team of the Beijing Head Office. In strict compliance with the inheritance laws of China and Japan, as well as the Agreement between the Government of the People's Republic of China and the Government of Japan for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income, the team leveraged Guozun Cathay’s years of experience in cross-border family legal services and dual-jurisdiction practice qualifications to provide the Chinese national heir with a full-chain solution of "domestic judicial confirmation + overseas tax compliance".
This case has been included in Guozun Cathay’s 2026 Typical Case Library on Cross-Border Family Affairs and Wealth Succession. Its case-handling model of "dual-jurisdiction legal argumentation + evidence chain completion + proactive tax risk prevention and control" has been widely applied in the resolution of Sino-Japanese cross-border inheritance disputes.
I. Case Background and Engagement Process
Ms. Su, a Chinese national, had a father-in-law of Japanese nationality who had long resided in China with his family. Her husband was also of Japanese nationality, and her mother-in-law was of Chinese nationality. In August 2025, the father-in-law passed away due to illness, leaving estate funds totalling approximately RMB 3.8 million in domestic bank accounts. As all heirs had long lived in China, the family hoped to legally transfer the estate to the mother-in-law through Chinese judicial proceedings, so as to avoid subsequent tax filing defects and retroactive taxation risks in Japan.
When the family initially sorted out materials on their own, they found that documents including IOUs, witness testimonies, partial transfer vouchers and WeChat communication records were not in sufficiently rigorous form. In addition, due to differences between China and Japan in inheritance jurisdiction, identity recognition and tax rules, they were unable to complete the legal transfer and compliance filing of the estate independently.
On 17 October 2025, Ms. Su was connected to the Japan Office through the Beijing Head Office of Guozun Cathay Associates. Given that the case involved three core difficulties – application of Sino-Japanese dual-jurisdiction inheritance law, cross-border identity validity recognition, and cross-border tax compliance – the Japan Office activated the Sino-Japanese Collaborative Case Handling Mechanism on the same day, and set up a dedicated case team in conjunction with the Beijing Head Office (comprising 2 locally licensed Japanese lawyers and 3 professional lawyers specialising in cross-border family affairs and wealth succession from the Beijing Head Office) to act as the sole agent for this cross-border inheritance administration matter.
II. Full Process of Sino-Japanese Joint Case Handling
This case adopted a standardised collaborative model: the Beijing Head Office is responsible for evidence construction and judicial procedure advancement under Chinese law, while the Japan Office is responsible for compliance argumentation and tax risk prevention and control under Japanese law. All stages have written records and verifiable outcomes:
1. 17 October 2025 – 31 October 2025: Dual-Jurisdiction Case Risk Assessment
Beijing Head Office: Completed preliminary sorting of all materials submitted by the client (including IOUs, transfer vouchers, WeChat communication records and witness testimonies), issued the Assessment Report on Inheritance Jurisdiction and Estate Legality under Chinese Law, confirmed the jurisdiction of Chinese courts over this case, clarified the personal legal property nature of the estate, and identified defects in existing evidence and directions for completion.
Japan Office: Relying on local Japanese legal and tax information channels, verified relevant rules on overseas estates and foreign heirs in the Inheritance Book of the Japanese Civil Code and the Japanese Inheritance Tax Act, confirmed the validity of effective legal documents issued by Chinese courts in Japanese tax filings, assessed potential Japanese tax filing obligations and retroactive taxation risks involved in the case, and eliminated core compliance risks.
2. 1 November 2025 – 30 November 2025: Evidence Chain Completion and Legal Path Argumentation
Beijing Head Office: In view of formal defects in existing documentary evidence, and in line with private lending evidence rules, guided the client to supplement and obtain complete transfer statements, improve the format of witness testimonies, and consolidate the original carrier of WeChat chat records. Multiple types of evidence formed a complete closed loop to prove the nature of the funds and estate ownership. Meanwhile, the team completed the selection of competent courts and litigation path argumentation, and determined domestic judicial confirmation as the core solution.
Japan Office: In response to the identity recognition issue of the Chinese national heir, issued the Compliance Opinion on Heir Identity and Estate Acquisition under Japanese Law, clarified the recognition standards for the mother-in-law’s inheritance right as a Chinese spouse under Japanese law, and confirmed that the domestic judicial confirmation result does not violate the mandatory provisions of Japanese law, removing legal obstacles for subsequent tax filings.
3. 1 December 2025 – 31 January 2026: Filing Materials Preparation and Tax Scheme Optimisation
Beijing Head Office: Completed the drafting, verification and submission of all filing materials, simultaneously prepared trial evidence plans and mediation plans, and formulated multiple response strategies for core issues such as estate ownership and transfer methods.
Japan Office: Simultaneously aligned with the practical requirements of Japanese tax filing, and combined with provisions of the Sino-Japanese bilateral tax agreement to optimise the timing and process design of estate transfer. It clarified the compliance path using effective judicial documents as the basis for tax filing, and minimised double taxation risks and subsequent verification risks.
4. 1 February 2026 – 31 March 2026: Judicial Procedure Advancement and Mediation Implementation
Beijing Head Office: Cooperated with the court to complete trial investigation procedures, fully presented evidence on estate composition and inheritance basis to the court, actively promoted mediation and negotiation among all parties, and reached consensus on estate ownership, transfer paths, and the rights and obligations of all parties.
Japan Office: Simultaneously followed up on the latest developments in Japanese tax rules, conducted compliance review under Japanese law on the content of the mediation agreement, ensured that the estate disposal method agreed in the agreement meets Japanese tax filing requirements, and avoided subsequent compliance disputes.
5. 1 April 2026 – 28 April 2026: Entry into Force of Documents and Completion of Estate Transfer
Beijing Head Office: Received the effective legal document issued by the court, assisted the client in coordinating with domestic banks to complete estate fund transfer procedures, and the full RMB 3.8 million estate was successfully transferred to the mother-in-law’s account.
Japan Office: Delivered the Sino-Japanese Cross-Border Inheritance Tax Compliance Guide to the client, clarifying Japanese-side filing procedures, required materials, precautions and timelines, and set out key points for responding to subsequent tax verifications, ensuring a closed compliance loop throughout the process.
III. Core Case Handling Difficulties and Authoritative Solutions
The difficulties encountered in this case are common issues in Sino-Japanese cross-border inheritance disputes. Relying on dual-jurisdiction professional capabilities and extensive practical experience, the Guozun Cathay joint team has developed a replicable standardised solution:
1. Conflict of Jurisdiction and Applicable Law in Cross-Border Inheritance
Professional Basis: Article 31 of the Law of the People's Republic of China on the Application of Laws in Foreign-Related Civil Relations; Item 3 of Article 34 of the Civil Procedure Law of the People's Republic of China; Article 888 of the Japanese Civil Code; Article 36 of the Japanese Act on General Rules for Application of Laws.
Solution: Establish the jurisdiction of Chinese courts using "the place where the main estate is located" as the connecting point. Meanwhile, combined with Japanese law provisions on the applicable law for inheritance, demonstrate the recognisability of domestic judicial procedure results under Japanese law, ensuring that judicial confirmation results have legal effect in both China and Japan.
2. Validity Completion of Defective Evidence
Professional Basis: Article 1122 of the Civil Code of the People's Republic of China; Article 66 of the Civil Procedure Law of the People's Republic of China; Article 16 of the Provisions of the Supreme People's Court on Several Issues Concerning the Application of Law in the Trial of Private Lending Cases; Article 179 of the Japanese Code of Civil Procedure.
Solution: Adopt a three-dimensional evidence supplementation model of "documentary evidence reinforcement + electronic data consolidation + witness testimony standardisation". IOUs with formal defects are cross-verified with complete transfer statements, original chat records and witness testimonies to form a complete evidence chain, meeting the evidence standards for judicial and tax recognition in both China and Japan.
3. Avoidance of Cross-Border Tax Risks
Professional Basis: Sino-Japanese Agreement for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income; Articles 11 and 28 of the Japanese Inheritance Tax Act.
Solution: Establish a handling model of "judicial confirmation first + tax compliance follow-up". Take the effective legal document of the Chinese court as the core basis for Japanese tax filing, clarify the nature and ownership of the estate, and combine the credit rules of the bilateral tax agreement to avoid double taxation risks and retroactive verification risks from the Japanese tax authority.
4. Cross-Jurisdictional Heir Identity Confirmation
Professional Basis: Article 1127 of the Civil Code of the People's Republic of China; Article 890 of the Japanese Civil Code; Article 31 of the Japanese Act on General Rules for Application of Laws.
Solution: Demonstrate the legality of the heir’s identity from two dimensions: Chinese statutory inheritance rules and the Japanese spouse inheritance system. Confirm that the inheritance right of the Chinese spouse complies with the laws of both countries, ensuring that the result of domestic estate acquisition does not violate the mandatory requirements of Japanese law.
IV. Authoritative Legal Bases Applicable to This Case
(A) Chinese Laws
1.Article 1122 of the Civil Code of the People's Republic of China: The estate of a natural person means the personal lawful property left behind at the time of his death. An estate that may not be inherited in accordance with the law or by its nature may not be inherited.
2.Article 1127 of the Civil Code of the People's Republic of China: The estate shall be inherited in the following order: (1) First in order: spouse, children, parents; …
3.Article 31 of the Law of the People's Republic of China on the Application of Laws in Foreign-Related Civil Relations: For statutory inheritance, the law of the place of habitual residence of the decedent at the time of his death shall apply; however, for statutory inheritance of immovable property, the law of the place where the immovable property is located shall apply.
4.Item 3 of Article 34 of the Civil Procedure Law of the People's Republic of China: A lawsuit brought for an inheritance dispute shall be under the jurisdiction of the people's court at the place of domicile of the decedent at the time of his death or at the place where the main estate is located.
(B) Japanese Laws
1.Article 888 of the Japanese Civil Code: Inheritance commences upon the death of the decedent.
2.Article 890 of the Japanese Civil Code: A spouse shall be an heir. In this case, if there are children, the spouse and the children shall be heirs of the same rank.
3.Article 11 of the Japanese Inheritance Tax Act: The value of inherited property shall be based on the market price at the time of the decedent's death.
4.Article 36 of the Japanese Act on General Rules for Application of Laws: Inheritance shall be governed by the national law of the decedent.
(C) Bilateral Agreement
Relevant provisions of the Agreement between the Government of the People's Republic of China and the Government of Japan for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income: Coordinate the taxation authority of the two countries over cross-border property and income, clarify tax credit and filing rules, and avoid double taxation.
V. Authoritative Practical Recommendations Based on Case Experience
Combined with years of experience in Sino-Japanese cross-border family legal services from Guozun Cathay Japan Office, the following three authoritative recommendations are put forward for families and individuals with Sino-Japanese cross-border inheritance needs:
1.Proactive inheritance planning: Cross-border families should formulate wealth succession plans in advance, and where necessary, execute wills that meet the legal requirements of both jurisdictions to clarify the scope of the estate, inheritance methods and applicable laws, so as to reduce subsequent inheritance disputes and compliance risks.
2.Standardised evidence preservation: Properly preserve documents such as IOUs, transfer vouchers and communication records involving cross-border property, and promptly complete notarisation and consular legalisation of important documents to ensure that evidence has legal effect in both jurisdictions.
3.Professional intervention in rights protection: When a cross-border inheritance dispute or estate disposal demand arises, a legal team with Sino-Japanese dual-jurisdiction service capabilities should be instructed to intervene at an early stage, to synchronise judicial procedures and tax compliance design, and avoid tax retroactivity or property loss caused by procedural defects.